The stuff Gu Yu hammered out might not be appropriate and could even be faulty, yet didn't all systems and ideologies start from something crude then got improved and perfected over time so that the systems could get established and ideologies passed on?
The above-mentioned were only the secondary levels of the Human Immortals. The Deity, Earth and Heaven ones were yet to come!
In reconstructing the essence-consuming method in a period when Taoist skills were in terminal decline, Gu Yu tried his best to keep his explanation coherent with little ambiguity, and made sure the choice of words was close to modern terminology. To some extent, he was leaving his own mark in the long history.
